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CLYMER VF500C 500F (1984-1985)
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Honda CLYMER VF500C 500F (1984-1985) [172/350] Exhaust and emission control systems

Honda CLYMER VF500C 500F (1984-1985) [172/350] Exhaust and emission control systems

@

EXHAUST

AND

EMISSION CONTROL

SYSTEMS

l6L

7. Apply

vacuum to the diaphragm

with

the

hand

pump (Figure

50).

Fuel should

flow out

when

l0-20

mm

Hg

(0.5-0.8

in.

Hg)

of

vacuum is applied.

8. If

fuel

does

not flow, turn the

fuel

shutoff

valve

to the

RES

posititon

and

check

if fuel

flows

out.

9.

If

the

fuel flows

in the

RES

position

the

vacuum

diaphragm

is damaged

or the

vacuum circuit

is

blocked.

10.

If

the

fuel

will not

flow in the RES

position,

the

internal strainer,

the

fuel

passageway

or

the

fuel

tank

cap breather

hole is blocked.

11. To inspect the

vacuum diaphragm,

perform

the

following:

a.

Turn

the

fuel shutoff

valve to the

OFF

position.

b.

Remove

the

screws

securing

the

vacuum

diaphragm

assembly

(B,

l'igure

49)

and

remove

the

assembly.

c.

Inspect

the

diaphragm

for

wear

or

damage.

d. Check the

spring

to see

if

it has sagged or

is

broken.

e.

If

any of

the

parts

of

the

vacuum diaphragm

are

worn

or damaged,

all

pafts

of the

vacuum

diaphragm

must be

replaced as a

unit.

They

are

not

sold

separately.

f. Reassemble the

vacuum diaphragm

assembly.

Make

sure

that the

diaphragm

is not

pinched

in

the

valve

body

during assembly.

12.

Install

the

fuel tank as

described

in

this

chapter.

FUEL

PUMP

Fuel

pump performance

testing

is covered

in

Chapter Seven.

Removal/Installation

(Magna

Models)

Refer to

Figure 51

for this

procedure.

1.

Remove

both

side covers.

2. Disconnect the

battery

negative

lead.

3.

Drain

the

fuel

from both

fuel tanks

as described

under

Secondary

Fuel Tank

Removal/Installation

in this chapter.

It is

not necessary

to

remove the

secondary

fuel

tank.

4.

Remove

the

battery

as described

in

Chapter

Three.

5.

Partially

pull

the battery

box

out of

the

frame

and slide the

spark

units

out of

the back

side of

the

battery

box.

Remove

the battery

box.

6.

Disconnect the

2-pin electrical

connector

to the

fuel

pump.

7. Disconnect the

fuel lines

going

to the

carburetor

assembly

and to

the secondary

fuel

tank.

Insert

golf

tees

into

the end

of each

fuel

line

to

prevent

fuel

leakage.

NOTE

If

the

drainedfuel

is

kept clean

it can be

reused.

If it becomes

contaminated

during

this

procedure,

dispose

of it

properly.

Check

with local

regulations

for

proper

disposal

of

gasoline.

5.

Connect

a

portable

hand

vacuum

pump

to

the

vacuum

side

(diaphragm

cover)

of the

fuel

shutoff

valve

(A,

Figure

49).

6.

Turn the

fuel shutoff

valve

to the

ON

position.

Fuel should

not flow

from the carburetor

fuel

line.

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